用MANDELSTAM修正过的GELL　MANN LOW方法计算顶角DDσ的形状因子和耦合常数
Calculation of the form factor and coupling constant for vertex ？？DDσ？？ by the mandelstam generalization of The gell mann low method

计算了？？DDσ？？相互作用的形状因子和耦合常数. 为了把？？D？？0？Ы樽泳哂心诓拷峁沟男в？考虑进去，用Bethe Salpeter振幅来描述重介子态. 夸克流在重介子态之间的矩阵元通过Mandelstam修正过的Gell Mann Low方法计算. 对于这一方法所要求的Bethe Salpeter不可约核，采用了最低阶近似. 在得到？？DDσ？？相互作用的形状因子后，计算了？？DDσ？У鸟詈铣Ｊ？.
The form factor and coupling constant for vertex ？？DDσ？？are calculated. For taking into account the inner structure of ？？D？？0？？meson. The Bethe Salpeter amplitude is adopted to describe the heavy meson states. The Mandelstam generalization of the Gell Mann Low methods is applied to calculate the matrix element of quark current between the heavy meson states. The lowest order approximation is taken for the Bethe Salpeter irreducible kernel which is required by the Mandelstam generalization of the Gell Mann Low method. After obtaining the ？？DDσ？？form factor, the ？？DDσ？？coupling constant is worked out